[itecz26]

:nth-*() series accept non-ASCII digits and digit separators

parse_series() converts the a and b parts of an An+B argument with Python's int(), which also accepts any Unicode decimal digit and _ separators. Non-ASCII characters tokenize as an IDENT, so they reach parse_series() and get turned into a position:

>>> GenericTranslator().css_to_xpath("p:nth-child(٣)")   # ARABIC-INDIC DIGIT THREE
'descendant-or-self::p[count(preceding-sibling::*) = 2]'
>>> GenericTranslator().css_to_xpath("p:nth-child(３)")   # FULLWIDTH DIGIT THREE
'descendant-or-self::p[count(preceding-sibling::*) = 2]'
>>> GenericTranslator().css_to_xpath("p:nth-child(2n+1_0)")
'descendant-or-self::p[(count(preceding-sibling::*) >= 9) and ((count(preceding-sibling::*) +1) mod 2 = 0)]'

The An+B microsyntax (CSS Syntax §6) is built from number and ident tokens with ASCII digits only, so browsers reject these selectors as invalid instead of matching the 3rd or 10th child. Anything that validates a selector with a browser or another CSS parser and then runs it through cssselect (or the other way round) sees two different meanings for the same string. The integer parts are now checked against [+-]?[0-9]+ before int(), so these raise ExpressionError like other invalid series; ASCII input is unaffected and the existing tests pass unchanged. Regression assertions are added to test_series.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.79%. Comparing base (ec61e4b) to head (10f156b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   99.79%   99.79%           
=======================================
  Files           3        3           
  Lines         987      992    +5     
  Branches      162      163    +1     
=======================================
+ Hits          985      990    +5     
  Misses          1        1           
  Partials        1        1           

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